FileUtils, some typos fixes

src/Utils/FileUtils.cpp

@@ -0,0 +1,56 @@
+#include "Utils/FileUtils.h"
+
+String readFileString(const String& filename, const String& str_to_found) {
+    String res = "failed";
+    auto file = SPIFFS.open("/" + filename, "r");
+    if (file && file.find(str_to_found.c_str())) {
+        res = file.readStringUntil('\n');
+    }
+    file.close();
+    return res;
+}
+
+String addFile(const String& fileName, const String& str) {
+    auto file = SPIFFS.open("/" + fileName, "a");
+    if (!file) {
+        return "Failed to open file";
+    }
+    file.println(str);
+    file.close();
+    return "Write sucсess";
+}
+
+String writeFile(const String& fileName, const String& str) {
+    auto file = SPIFFS.open("/" + fileName, "w");
+    if (!file) {
+        return "Failed to open file";
+    }
+    file.print(str);
+    file.close();
+    return "Write sucсess";
+}
+
+String readFile(const String& fileName, size_t len) {
+    File file = SPIFFS.open("/" + fileName, "r");
+    if (!file) {
+        return "Failed";
+    }
+    size_t size = file.size();
+    if (size > len) {
+        file.close();
+        return "Large";
+    }
+    String temp = file.readString();
+    file.close();
+    return temp;
+}
+
+String sizeFile(const String& fileName) {
+    auto file = SPIFFS.open("/" + fileName, "r");
+    if (!file) {
+        return "Failed";
+    }
+    size_t size = file.size();
+    file.close();
+    return String(size);
+}