typos: fix

Makefile

@@ -51,7 +51,7 @@ clean:
 .PHONY: fmt
 fmt:
 	find src -iname \*.hpp -o -iname \*.h -o -iname \*.cpp -o -iname \*.c | xargs clang-format --style=Chromium -i --Werror
-	echo All fiels in src/ have been formatted.
+	echo "All files in src/ have been formatted."
 
 .PHONY: fmt_check
 fmt_check:

src/main.cpp

@@ -133,7 +133,7 @@ void check_bg_processes() {
     // status code IS NOT exit code!
     // see https://linux.die.net/man/2/waitpid
     pid_t res = waitpid(p->getPid(), status_code, WNOHANG);
-    // returns the pid on sucess
+    // returns the pid on success
     if (res != 0) {
       printf("-- BG-Process with PID %d finished with Status Code %d\n",
              p->getPid(), status_code[0]);

src/parse.cpp

@@ -206,7 +206,7 @@ CommandChain parse_command_chain(const std::string* const input) {
   std::vector<std::string> basic_command_strs = str_split_char(input, '|');
   for (auto& basic_command_str : basic_command_strs) {
     trim(basic_command_str);
-    // we want to trim the strings because "ls | cat" splitted by '|' would
+    // we want to trim the strings because "ls | cat" split by '|' would
     // otherwise have spaces at the begin/end
   }