Add str_view_t

include/lexer/lexer.h

@@ -7,6 +7,8 @@
 #define VALID_JSON true
 #define INVALID_JSON false
 
+typedef const char *const str_view_t;
+
 typedef enum {
   TK_L_BRACE,
   TK_R_BRACE,
@@ -27,6 +29,7 @@ typedef union {
   void *no_val;
   i64 num_int;
   f64 num_frac;
+  str_view_t string;
 } token_value_t;
 
 typedef struct {