refactor: restructure trading modules and add price calculation utilities

- Remove redundant pool.rs files from trading protocols
- Consolidate protocol logic into common.rs files
- Add comprehensive price calculation utilities for all protocols
- Add decimals constants module
- Restructure utils module for better organization
- Update documentation with price utilities information

Breaking changes:
- Removed bonding_curve.rs from pumpfun module
- Consolidated trading logic across protocols
- Refactored utils module structure

src/instruction/bonk.rs

@@ -5,16 +5,17 @@ use spl_associated_token_account::instruction::create_associated_token_account_i
 use spl_token::instruction::close_account;
 
 use crate::{
-    constants::bonk::{accounts, BUY_EXECT_IN_DISCRIMINATOR, SELL_EXECT_IN_DISCRIMINATOR},
-    constants::trade::trade::DEFAULT_SLIPPAGE,
-    trading::bonk::{
-        common::{get_amount_out, get_pool_pda, get_vault_pda},
-        pool::Pool,
+    constants::{
+        bonk::{accounts, BUY_EXECT_IN_DISCRIMINATOR, SELL_EXECT_IN_DISCRIMINATOR},
+        trade::trade::DEFAULT_SLIPPAGE,
     },
-    trading::common::utils::get_token_balance,
-    trading::core::{
-        params::{BonkParams, BuyParams, SellParams},
-        traits::InstructionBuilder,
+    trading::{
+        bonk::common::{fetch_pool_state, get_amount_out, get_pool_pda, get_vault_pda},
+        common::utils::get_token_balance,
+        core::{
+            params::{BonkParams, BuyParams, SellParams},
+            traits::InstructionBuilder,
+        },
     },
 };
 
@@ -70,7 +71,7 @@ impl BonkInstructionBuilder {
         let mut real_quote = protocol_params.real_quote.unwrap_or(0);
 
         if virtual_base == 0 || virtual_quote == 0 || real_base == 0 || real_quote == 0 {
-            let pool = Pool::fetch(params.rpc.as_ref().unwrap(), &pool_state).await?;
+            let pool = fetch_pool_state(params.rpc.as_ref().unwrap(), &pool_state).await?;
             virtual_base = pool.virtual_base as u128;
             virtual_quote = pool.virtual_quote as u128;
             real_base = pool.real_base as u128;

src/instruction/pumpswap.rs

@@ -20,9 +20,7 @@ use crate::{
         pumpswap::{
             self,
             common::{
-                coin_creator_vault_ata, coin_creator_vault_authority, fee_recipient_ata, find_pool,
-                get_global_volume_accumulator_pda, get_token_amount,
-                get_user_volume_accumulator_pda, get_wsol_amount,
+                coin_creator_vault_ata, coin_creator_vault_authority, fee_recipient_ata, fetch_pool, find_pool, get_global_volume_accumulator_pda, get_token_amount, get_user_volume_accumulator_pda, get_wsol_amount
             },
         },
     },
@@ -138,7 +136,7 @@ impl PumpSwapInstructionBuilder {
         let rpc = params.rpc.as_ref().unwrap().clone();
         // Find pool
         let pool = find_pool(rpc.as_ref(), &params.mint).await?;
-        let pool_data = pumpswap::pool::Pool::fetch(rpc.as_ref(), &pool).await?;
+        let pool_data = fetch_pool(rpc.as_ref(), &pool).await?;
         let pool_base_token_reserves =
             get_token_balance(rpc.as_ref(), &pool, &pool_data.base_mint).await?;
         let pool_quote_token_reserves =
@@ -169,7 +167,7 @@ impl PumpSwapInstructionBuilder {
         let rpc = params.rpc.as_ref().unwrap().clone();
         // Find pool
         let pool = find_pool(rpc.as_ref(), &params.mint).await?;
-        let pool_data = pumpswap::pool::Pool::fetch(rpc.as_ref(), &pool).await?;
+        let pool_data = fetch_pool(rpc.as_ref(), &pool).await?;
         let pool_base_token_reserves =
             get_token_balance(rpc.as_ref(), &pool, &pool_data.base_mint).await?;
         let pool_quote_token_reserves =