fix(integer-base-converter): handle non-decimal char and better error message

src/utils/error.ts

@@ -0,0 +1,24 @@
+import _ from 'lodash';
+
+export { getErrorMessageIfThrows };
+
+function getErrorMessageIfThrows(cb: () => unknown) {
+  try {
+    cb();
+    return undefined;
+  } catch (err) {
+    if (_.isString(err)) {
+      return err;
+    }
+
+    if (_.isError(err)) {
+      return err.message;
+    }
+
+    if (_.isObject(err) && _.has(err, 'message')) {
+      return (err as { message: string }).message;
+    }
+
+    return 'An error as occurred.';
+  }
+}