Revert "Refactor loanEligibility"

This reverts commit 1f6796c3e6.

src/checkLoanEligibility.c

@@ -2,19 +2,29 @@
 #include "_file_information.h"
 
 bool checkLoanEligibility(int user_id) {
+
+    // Eligible only when user is present in CustomerDataFile 
+
+    bool keep_reading = true;
+    bool eligibility  = false;
+    char buffer[MAX_LENGTH];
+
     FILE *file = fopen(CUSTOMER_DATA_FILE, "r");
-    if (file == NULL) {
-        return false;
-    }
 
-    int customer_id;
-    while (fscanf(file, "%d", &customer_id) == 1) {
-        if (customer_id == user_id) {
-            fclose(file);
-            return true;
+    while(keep_reading) {
+        fgets(buffer, MAX_LENGTH, file);
+
+        if (feof(file)) {
+            keep_reading = false;
+        }
+        if(user_id == atoi(buffer)) {
+            eligibility  = true;
+            keep_reading = false;
         }
+
     }
 
     fclose(file);
-    return false;
+    return eligibility;
+
 }