docs: improve documentation for private functions

.github/codegen.js

@@ -3,6 +3,8 @@
  */
 const fs = require('fs/promises');
 
+// If you used this codegen, don't forget to reset
+// the letters array just to be a single value.
 const letters = 
 [
 `        
@@ -11,157 +13,7 @@ const letters =
  | (_| |
   \\__,_|
         `,
-` _     
-| |__  
-| '_ \\ 
-| |_) |
-|_.__/ 
-       `,
-`       
-   ___ 
-  / __|
- | (__ 
-  \\___|
-       `,
-`      _ 
-   __| |
-  / _  |
- | (_| |
-  \\__,_|
-        `,
-`       
-   ___ 
-  / _ \\
- |  __/
-  \\___|
-       `,
-`   __ 
-  / _|
- | |_ 
- |  _|
- |_|  
-      `,
-`        
-   __ _ 
-  / _\` |
- | (_| |
-  \\__, |
-  |___/ `,
-`  _     
- | |__  
- | '_ \\ 
- | | | |
- |_| |_|
-        `,
-`  _ 
- (_)
- | |
- | |
- |_|
-    `,
-`    _ 
-   (_)
-   | |
-   | |
-  _/ |
- |__/ `,
-`  _    
- | | __
- | |/ /
- |   < 
- |_|\\_\\
-       `,
-`  _ 
- | |
- | |
- | |
- |_|
-    `,
-`            
-  _ __ ___  
- | '_ \` _ \\ 
- | | | | | |
- |_| |_| |_|
-            `,
-`        
-  _ __  
- | '_ \ 
- | | | |
- |_| |_|
-        `,
-`        
-   ___  
-  / _ \ 
- | (_) |
-  \___/ 
-        `,
-`        
-  _ __  
- | '_ \ 
- | |_) |
- | .__/ 
- |_|    `,
-`        
-   __ _ 
-  / _\` |
- | (_| |
-  \\__, |
-     |_|`,
-`       
-  _ __ 
- | '__|
- | |   
- |_|   
-       `,
-`      
-  ___ 
- / __|
- \\__ \\
- |___/
-      `,
-`  _   
- | |_ 
- | __|
- | |_ 
-  \\__|
-      `,
-`        
-  _   _ 
- | | | |
- | |_| |
-  \\__,_|
-        `,
-`        
- __   __
- \\ \\ / /
-  \\ V / 
-   \\_/  
-        `,
-`           
- __      __
- \\ \\ /\\ / /
-  \\ V  V / 
-   \\_/\\_/  
-           `,
-`       
- __  __
- \\ \\/ /
-  >  < 
- /_/\\_\\
-       `,
-`        
-  _   _ 
- | | | |
- | |_| |
-  \\__, |
-  |___/ `,
-`      
-  ____
- |_  /
-  / / 
- /___|
-      `,
-  ]
+]
 
 ;(async () => {
   let output = ''

asciitxt.go

@@ -1,4 +1,6 @@
-// ASCIITXT is a simple utility for creating ascii texts.
+// ASCIITXT is a simple utility for creating ASCII texts.
+// The text that can be created is limited to a certain input as the maintainers
+// have to input all the text manually.
 package asciitxt
 
 import (
@@ -61,7 +63,7 @@ func WithConfig(txt string, config Config) string {
 	return output.String()
 }
 
-//
+// Get a depth (vertical) length for a certain style.
 func getStyleLength(style Style) int {
 	switch style {
 	case StyleStandard:
@@ -71,6 +73,8 @@ func getStyleLength(style Style) int {
 	}
 }
 
+// Get a letter by a certain style.
+// It returns a panic if the style input is invalid.
 func getStyleLetter(style Style, letter string) []string {
 	switch style {
 	case StyleStandard: