changed contrib project name for clarity

diff --git a/contrib/declib/.gitignore b/contrib/single_file_decoder/.gitignore
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rename from contrib/declib/.gitignore
rename to contrib/single_file_decoder/.gitignore

diff --git a/contrib/declib/README.md b/contrib/single_file_decoder/README.md
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rename from contrib/declib/README.md
rename to contrib/single_file_decoder/README.md

diff --git a/contrib/declib/build.sh b/contrib/single_file_decoder/build.sh
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rename from contrib/declib/build.sh
rename to contrib/single_file_decoder/build.sh

diff --git a/contrib/declib/combine.sh b/contrib/single_file_decoder/combine.sh
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rename from contrib/declib/combine.sh
rename to contrib/single_file_decoder/combine.sh

diff --git a/contrib/declib/examples/README.md b/contrib/single_file_decoder/examples/README.md
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rename from contrib/declib/examples/README.md
rename to contrib/single_file_decoder/examples/README.md

diff --git a/contrib/declib/examples/emscripten.c b/contrib/single_file_decoder/examples/emscripten.c
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rename from contrib/declib/examples/emscripten.c
rename to contrib/single_file_decoder/examples/emscripten.c

diff --git a/contrib/declib/examples/shell.html b/contrib/single_file_decoder/examples/shell.html
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rename from contrib/declib/examples/shell.html
rename to contrib/single_file_decoder/examples/shell.html

diff --git a/contrib/declib/examples/simple.c b/contrib/single_file_decoder/examples/simple.c
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rename from contrib/declib/examples/simple.c
rename to contrib/single_file_decoder/examples/simple.c

diff --git a/contrib/declib/zstddeclib-in.c b/contrib/single_file_decoder/zstddeclib-in.c
similarity index 100%
rename from contrib/declib/zstddeclib-in.c
rename to contrib/single_file_decoder/zstddeclib-in.c