First version for string_to_number, just one test, is working fine, i'm considering swithching to handling only integers for in the future to manage in special struct that manages doubles as fractions, obviously this will mean changing nodes for general numbers to integers/fractions and shit

src/lexer.c

@@ -1,6 +1,10 @@
 #include "lexer.h"
+#include <ctype.h>
+#include <math.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <strings.h>
+#include <limits.h>
 
 #define NODE_ARRAY_DEFAULT_SIZE 64
 // Helps  state machine for the lexer :)
@@ -78,6 +82,16 @@ ASTNodeArrayErr ASTNodeArray_pop(ASTNodeArray *arr, size_t index, ASTNode *out)
     if (index >= arr->len) {
         return ARRAY_OUT_OF_BOUNDS;
     }
+
+    if (arr->cap / 4 > arr->len) {
+        size_t new_cap = arr->cap / 2;
+        ASTNode *tmp = realloc(arr->data, new_cap * sizeof(ASTNode));
+        if (tmp == NULL) {
+            return ARRAY_ALLOC;
+        }
+        arr->data = tmp;
+        arr->cap = new_cap;
+    }
     
     if (out != NULL) {
         ASTNode node_to_delete = arr->data[index];
@@ -97,3 +111,40 @@ size_t ASTNodeArray_len(ASTNodeArray *arr) {
     }
     return arr->len;
 }
+
+// CURRENTLY, it only supports ints, not clear how floating
+// point is implemented but i'll figure it out
+LexerErr string_to_number(const char *input, size_t *offset, double *number) {
+    char buf[128] = { '\0' };
+    size_t buf_pos = 0;
+
+    size_t current = *offset;
+    while (isdigit(input[current])) {
+        buf[buf_pos] = input[current];
+        
+        if (buf_pos >= sizeof(buf)) {
+            return LEXER_BUF_OVERFLOW;
+        }
+        current++;
+        buf_pos++;
+    }
+    
+    int c = 0;
+    long count = 0;
+    while (buf[c] != '\0') {
+        
+        int digit = buf[c] - '0';
+
+        if (count > (INT_MAX - digit) / 10) {
+            return LEXER_FAILED_NUMBER_CONVERSION;
+        }
+        count = count * 10;
+        count += digit;
+        
+        c++;
+    }
+
+    *number = (double) count;
+    *offset = current;
+    return LEXER_OK;
+}