fix: added new ast type and moved parsing functions to a different header

src/parser/parsing_utils.h

@@ -0,0 +1,24 @@
+/* @brief Parses a simple list of words (command and arguments)
+ * and returns the resulting ast
+ */
+struct ast *parse_simple_command(void);
+
+/* 
+ */
+struct ast *parse_if_rule(void);
+
+/*
+ */
+struct ast *parse_shell_command(void);
+
+/*
+ */
+struct ast* parse_compound_list(void);
+
+/*
+ */
+struct ast* parse_and_or(void);
+
+/*
+ */
+struct ast* else_clause(void);