docs: update per-program readmes

btn/README.md

@@ -5,7 +5,7 @@ This program prints a long string having no white-space characters, given a text
 ## Usage
 
 ```
-./btn N < TEXT_FILE_NAME
+btn N < TEXT_FILE_NAME
 
 where
    N = the number of characters before a new-line character;
@@ -31,4 +31,4 @@ python btn.py N < TEXT_FILE_NAME
 
 ```
 ghc buntang.hs
-```
+```

hd/README.md

@@ -5,7 +5,10 @@ This program adds the string `"# "` to the beginning of the stdin and prints it,
 ## Usage
 
 ```
-./hd TEXT
+hd < TEXT_FILE_NAME
+
+where
+   TEXT_FILE_NAME = the file name to be input-redirected.
 ```
 
 ## Implementations
@@ -15,7 +18,7 @@ This program adds the string `"# "` to the beginning of the stdin and prints it,
 This implementation does not support trim.
 
 ```sh
-clang hd.c -o hd
+make
 ```
 
 ### C++
@@ -42,4 +45,4 @@ rustc hd.rs -C debuginfo=0 -C opt-level=z -C strip=symbols -o hd
 
 ```
 bun test
-```
+```

hhss/README.md

@@ -7,7 +7,7 @@ P.S. hhss is an incorrect initialism for hweng-seol-su-seol, which means gibberi
 ## Usage
 
 ```
-./hhss NUM_SENTENCES
+hhss NUM_SENTENCES
 
 where
    NUM_SENTENCES = the number of sentences to print out.
@@ -40,4 +40,4 @@ mkdir build
 cd build
 cmake ..
 make
-```
+```

nsy/README.md

@@ -5,7 +5,7 @@ This program generates a "noisy" sentence by including an exclamation/question m
 ## Usage
 
 ```
-./nsy MARK_KIND < TEXT_FILE_NAME
+nsy MARK_KIND < TEXT_FILE_NAME
 
 where
    MARK_KIND = e | q   (exclamation or question)
@@ -46,4 +46,4 @@ In Linux,
 make all
 ```
 
-In Windows, use Visual Studio 2022.
+In Windows, use Visual Studio 2022.

nsy2/README.md

@@ -0,0 +1,22 @@
+## Introduction
+
+This program generates a "noisy" sentence by including an exclamation/question mark between each words.
+
+## Usage
+
+```
+nsy2 MARK_KIND < TEXT_FILE_NAME
+
+where
+   MARK_KIND = e | q   (exclamation or question)
+             = eu | qu (upside down)
+   TEXT_FILE_NAME = the file name to be input-redirected.
+```
+
+## Implementations
+
+### C
+
+```
+make
+```

yandere/README.md

@@ -5,19 +5,19 @@ This program prints a yandere-like string to stdout, *ad infinitum*.
 ## Usage
 
 ```
-./yandere
+yandere
 ```
 
 ## Implementations
 
 ### C
 
 ```
-gcc -o yandere yandere.c
+make
 ```
 
 ### Haskell
 
 ```
 ghc yandere.hs
-```
+```