feat: Add LeetCode API communication functions

Author: WhiteHyun

scripts/leetcode_helper.bash

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+# Extract the title-slug from the LeetCode URL
+function extract_problem_name() {
+  local url="$1"
+  echo "$url" | sed -n 's/.*\/problems\/\([^/]*\)\/.*/\1/p'
+}
+
+# Generates the GraphQL query to fetch problem details based on the provided title-slug
+function make_query() {
+  local question_slug=$1
+  # shellcheck disable=SC2016
+  local query='{
+  "query": "query selectProblem($titleSlug: String!) { question(titleSlug: $titleSlug) { questionFrontendId title titleSlug codeSnippets { langSlug code } } }",
+  "variables": {
+    "titleSlug": "'"$question_slug"'"
+  }
+}'
+  echo "$query"
+}
+
+# Sends a POST request to the LeetCode GraphQL API with the generated query
+function request() {
+  local query="$1"
+  local response
+  response=$(curl -s -X POST -H "Content-Type: application/json" --data "$query" https://leetcode.com/graphql)
+  echo -E "$response"
+}
+
+# Creates a file for the LeetCode problem
+#
+# Parses the JSON response from the LeetCode API, extracts relevant problem details,
+# generates the solution code template using the `make_solution_code()` function,
+# and saves the file using the `save_file()` function.
+function create_file() {
+  local json_data="$1"
+  local question_id
+  local title
+  local title_slug
+  local code_snippet
+  local content
+
+  question_id=$(echo -E "$json_data" | jq -r '.data.question.questionFrontendId')
+  title=$(echo -E "$json_data" | jq -r '.data.question.title')
+  title_slug=$(echo -E "$json_data" | jq -r '.data.question.titleSlug')
+
+  # Generate the code snippet
+  code_snippet=$(echo -E "$json_data" | jq -r ".data.question.codeSnippets[] | select(.langSlug == \"$LANGUAGE\") | .code")
+
+  # Generate the entire code
+  content=$(make_solution_code "$question_id" "$title" "https://leetcode.com/problems/$title_slug/description/" "$code_snippet")
+
+  save_file "$title_slug" "$content"
+}