feat: refactor and test tools steps utilities (#42693)

tools/challenge-helper-scripts/helpers/pad-with-leading-zeros.js

@@ -0,0 +1,18 @@
+// Prepends zero's to the given value until length is equal to 3:
+// '1' -> '001', '12' -> '012', ...
+// Note: always want file step numbers 3 digits
+function padWithLeadingZeros(value) {
+  if (!(typeof value === 'number' || typeof value === 'string')) {
+    throw `${value} should be of type number or string`;
+  }
+
+  const newValue = '' + value;
+
+  if (newValue.length > 3) {
+    throw `${newValue} should be less than 4 characters`;
+  }
+
+  return newValue.padStart(3, '0');
+}
+
+exports.padWithLeadingZeros = padWithLeadingZeros;